5.1.1 The Need for Homeostasis Flashcards
1
Q
What physiological factors are controlled by homeostasis
A
- Body temp
- Metabolic waste
- Blood pH
- Glucose concentration
- Water potential
2
Q
What are the 2 communication systems in mammals?
A
- Nervous system
- Endocrine system
3
Q
What are hormones?
A
- Chemical substance produced by endocrine gland
- Transmit information from one part of an organism to another to bring about a change
- Control functions that dont need INSTANT response
4
Q
Types of glands in body
A
5
Q
Why does pH need to be controlled?
A
- Enzymes have optimal pH
- Hydrogen bonds and ionic bonds can be broken by altering concentrations of OH- and H+ ions
- Changes tertiary structure of protein
- Shape of active site of enzyme changes
- No longer complementary to substrates
- Substrate complexes cannot form
- Enzyme is denatured
- Cannot perform its function
6
Q
Why does blood glucose concentration need to be regulated?
A
- Glucose concentration in blood affects water potential of blood and availability of respiratory substrates for cells
- Glucose needed for cellular respiration
7
Q
How do stomata carry out a homeostatic response?
A
- Guard cells open and close
- Regulating volume of gases in and out of leaves
- Monitors transpiration rate
- So regulates water loss in plants
